Non polar molecules with polar bonds

CCl4 is a non polar molecule with polar bonds because the dipoles acting in different directions cancell each other out . . .
I was wondering whether if one of the Cl atoms was replaced with another atom, say fluorine, would it still be a non polar molecules because the resulting dipole means fluorine is still slightly negative, or will it now be polar.
Im thinking it is polar because they the charges a no longer equal, so it is no longer electronically symmetrical, but I wanted to check.